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<?php $rows = array_reverse(array_chunk(range(1, 100), 10)); echo "<table>\n"; foreach ($rows as $level => $row) { if (($level-1) % 2) { $row = array_reverse($row); } echo "\t<tr>\n"; foreach ($row as $value) { echo "\t\t<td>$value</td>\n"; } echo "\t</tr>\n"; } echo "<table>\n";

preferences:
27.11 ms | 406 KiB | 5 Q